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Mr Williams said he immediately informed Flintshire County Council and claims they agreed to inspect the windows on Tuesday - but claimed no one turned up.

He said the cords are used to operate window vents which allow airflow and had been tied together before the couple moved into the property.

“The more people that are aware of this the better,” he said. “People need to check blinds/curtains/vents, the more it reaches people the safer it can be for children. We were so lucky.

“We went straight to the council and informed them there was a major issue with their windows, yet no call or visit since. They need to check all their properties with this vent system installed. New systems are safer.”

The marks left on Crystal's neck after her accident (Image: Karl Williams)

The Royal Society for the Prevention of Accidents (RoSPA) campaigned for increased safety measures from 2004 and a new safety standard for blinds was introduced in 2014.